Paper-stock-screening machine.



A. J. HAUG. PAPER STOCK SCREENING MACHINE.

APPLICATION FILED NOV- 7. I9I3.

Patented May 16, 1916.

2 SHEETS-SHEET I.

[NVEN TOR.

BY /W W64 ATTORNEY.

A.J HAUG.

PAPER STOCK SCREENING MACHINE.

APPLICATION FILED NOV- 7, 1913.

1. ,1 3,297. Patented May 16, 1916.

2 SHEETSSHEET 2.

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LVVENTOR.

ATTORNEY.

ANTON J. HAUG, OF NASHUA, NEW HAMPSHIRE, ASSIGNOR TO IMPROVED PAPER MACHINERY COMPANY, OF NASHUA, NEW HAMPSHIRE, A CORPORATION OF MAINE.

IAPER-STOCK-SCREENING MACHINE Specification of Letters Patent.

Application filed November 7, 1913. Serial No. 799,750.

the fine or good stock from the slivers,

shives or so-called knots. It is in fact a pulp screen.

My purpose is to provide a machine which willhave a continuous feed, continuous delivery ofthe screened stock and continuous dischargeof the knots and one which will rapidly carry the knots away from the other stock so that they will not form a filter or bed and so clog the operation.

My pulp screen is especially valuable for use in the first screening or knotting process wherein the large knots and other large pieces in thepulpare separated. It may be used to advantage, however, not only for the first knot screening but for the second or coarse screening, and for the third or fine screening. The only change necessary in these different processes'is the substitution of smaller perforations in the screening plates for the larger ones, the use of narrower slots or finer screening.

In the drawings, Figure 1 shows a sectional side elevation of the preferred form of the machine; Fig. 2 shows a sectional end elevation on the line X-Y of Fig. 1 looking toward the left. Fig.3 is a detail of the shaking action. Fig; 4 shows a sectional side elevation of a modification of the device with the drying cylinder removed. Fig. 5 shows a sectional end elevation of another modification of the device being a view similar to Fig. 2. Fig. 6 is a partial sectional side elevationof Fig. 5 as viewed from the left of line ST. Fig. 7 shows a modifiedform of perforated plate.

A is the tank into which the screened stock is delivered. 21 is the outlet therefrom.

H is a separating cylinder which is shown in Figs. 1, 2 and 4 as being polygonal. The

outside faces 10 of this separating cylinder are formed of screens or preferably of sheets of perforated metal and as shown in Fig. 2 the ends are partly covered preferably by similar screens or preferably perforated plates 11 and 12. As shown in Fig. 2, these end screens or plates 11 and 12 extend inward to about the same distance whereby there is a polygonal opening of considerable size at each end of the cylinder. Radial partitions 13. are also provided and these are preferably formed of perforated plates or screens similar to those on the outside face and ends.- They extend inward to about the same point as themward ends of plates 11 and 12. It will thus be seen that adjoining the outer face of separating cylinder B on the inner side thereof are formed a plurality of longitudinal pockets L which are open toward the center or axis of the cylinder and are preferably formed of perforated plates on all other sides. Cylinder B is supported on driving shaft C by means of a spider 16 which is fixed to shaft C and to the arms of which one end of cylinder B is firmly bolted. As the cylinder B is thus supported only at one end, I prefer to stiffen the other end by-bolting thereon a disk 17. Spider 16 also supports one end of drying cylinder K as will be hereafter explained. Shaft C and cylinder. B are so placed that as the cylinder revolves, the lower portion preferably extends below the surface of the liquid in tank A. I

It is not necessary that cylinder B should extend below the surface of the liquid in tank A but I find that better results are ob; tained by so doing as the movement of the cylinder through the liquid and the passage of the liquid through the perforated plates agitates the stock and prevents the formation of any filters or beds to clog the action. Extending into the central opening of cylinder B is the inlet pipe or conveyer F which conveys the unscreened stock inside thereof. It will thus be seen that the unscreened stock G is delivered into the sections or pockets L of cylinder B as'they passa certain point relative thereto.

I prefer to make the discharge end 20 of inlet pipe F atthe side as shown in Fig. 2 so that as the unscreened stock is discharged into the pockets, its weight will help to Patented May 16, 1916. v

revolve cylinder B in the direction of the arrow as shown. As the unscreened stock passes into the pockets L, the finer part thereof passes through the perforated plates into tank A while the knots, slivers and other undesirable material is carried along in the pocket until it reaches a point near the top as-the cylinder revolves when, as shown in Figs. 1 and 2 at 30, it slides off toward the axis of the cylinder and is received by a trough H which slopes downward in a direction 'away from the inlet pipe F. Attached tospider 16 and extending therefrom into separating cylinder B in such a position that its smaller end extends under and beyond the end of trough H is a delivery cone 70, which conducts the stock from trough H into drying cylinder K.

I prefer to deliver the knots and slivers as shown in Fig. 1.130 a drying cylinder K which is carried by the same spider or support 16 which carries separating cylinder B and is also supported at its other end by a disk 37 as shown. This drying cylinder K may be of any regular design in cross section but it should be in the form of a truncated cone or pyramid with walls which slope at the bottom from where they adjoin cylinder B downward toward the other end so that the knots 30 will travel along and be finally delivered through openings into a discharge outlet 41. From knot outlet 41, the knots may be removed in any desired way as by a belt conveyer. Drying cylinder K preferably is. made with a longitudinal skeleton frame work 18 which extends between spider 16-and disk 37 and is connected by perforated plates 19 which extend close to spider 16 and to within a short distance of disk 37 so that the knots 30 can be delivered through the opening between their ends and disk 37 into the knot outlet 41. The knots 30 are carried around by drying cylinder K and the moisture is dried out and whatever liquid there is escapes and falls into tank A.

To prevent the clogging of the holes in the perforated plates, to accelerate the process of separation and also to helpthe continuous feed and the delivery of the knots, I prefer to give the driving or supporting shaft C a reciprocating motion by any suitable means. This shaft is preferably driven by a pulley 38 and preferably at the other end I fix an end cam 42 and acompression spring 44 which tends to force shaft C, pulley 38 and cylinders K and B toward the left. In engagement with end cam 42, I may use one or more rollers 43 fixed to the shaft bearing/50 in enga ement with end.

cam 42 so that while sha t C is revolving, it is moved gently back and forth in its bearings 50 and 51.

As shown in Fig. 4, I may dispense with the drying cylinder K and deliver the knots,

'volve without outside power.

necessary with my device on account of the fact that the arrangement of the inlet pipe and the delivery end thereof is such that it will cause the separating cylinder to reuse adriving shaft, however, so that the speed may be equalized and so that there may be no possibility of the device becoming cloggedand overflowing. I

Also as shown in Figs. 5 and 6, I may use a separating cylinder M which is cylindrical on its outer .face which is formed of perforated plates 104. In this construction the end plates 101, 102 and partition plates 103 are imperforate, only the outside plates 104 being perforated. This makes the pockets imperforate except on the outside and thus adds to the propelling power of the stock from the inlet pipe acting thereon. I also show in Figs. 5 and 6, the delivery end 20 of the inlet pipe at a point higher up than in Figs. 1 and 2 whereby also greater power is obtained. f

In Fig. 7, I show a fragment of a plate 106 provided with slots 107 thereby forming a sort of grate which can be substituted for the perforated plates or wovenwire screens if desired. In fact any means such as parallel bars may be used to hold back the coarse stock andto allow the fine stock to drain oil; I prefer to have the perforations or meshes in the drying cylinder finer than those in the separating cylinder so that I prefer to any knotsor other large pieces which may be broken up or reduced in size in travelin around the two cylinders cannot fal through into the tank A.

The-shaft C is a supporting shaft for the separating cylinder or for the separating cylinder and drying cylinder and is a driving shaft only when it' carries a driving pulley, or it may be considered as a driving shaft whichsupports both cylinders and transmits power from the separating cyl- 'inder to the drying cylinder when a driving screens and the machine.

- inder, having a plurality of interior pockets pipe which enters the cylinder in such aopen toward the inside, with a stock inlet pipe which enters the cylinder in such a manner as to discharge into the pockets, a drying cylinder which adjoins the separating cylinder, and -a driving shaft which carrice the separating cylinder and the drying cylinder, together with atroughwhich slopes downward inside the separating cylinder to a point adjoining the drying cylinder, and a tank below the separating cylinder substantially as described.-

3. In a paper stock screening machine, the combination of a foraminous separating cylinder, having a plurality of interior pockets open toward the inside, with a stock inlet manner as to discharge into the pockets, a drying'cylinder which adjoins the separating cylinder, and a driving shaft which carries the separating cylinder and the drying cylinder, together with a trough which slopes downward inside the separating cylinder to a point adjoining the drying cylinder, and a cone which extends from the drying cylinder into the separating cylinder in operative relation with the trough.

4. In a paper stock screening machine, the combination of a foraminous separating cylinder, having perforated end plates which partly close its ends, and perforated partition plates between such end plates forming a plurality of perforated interior pockets open toward the inside, with a stock inlet pipe which enters the cylinder, a trough which slopes downward inside the cylinder,

and a driving shaft which carries the separating cylinder, together with a tank below said cylinder substantially as described.

5. In a paper stock screening machine, the combination of a foraminous separating cylinder having a plurality of interior pockets open toward the inside, with a stock inlet pipe which enters the cylinder, a trough which slopes downward inside'the cylinder,

driving shaft bearings, and a driving shaft slidable in saidbearings and which carries the separating cylinder, together with a tank below said cylinder, and means for moving the shaft back and forth in its bearings substantially as described.

6.. In a paper stock screening machine, the combination of a supporting shaft, with a foraminous separating cylinder carried thereby, having a plurality of interior pockets open toward the inside, a stock inlet pipe which enters the cylinder at such 'a' point as to discharge into the pockets on the inside between the top and bottom of the cylinder, a trough which slopes downward inside of and lengthwise of the cylinder, and a tank below the cylinder substantially as described.

7. In a paper stock screening machine, the

combination of a supporting shaft, with a separating cylinder having a pluralityof interior pockets which open toward the insideall the sides of said pockets being perforate, a stock inlet pipe which enters the cylinder at such a point as to discharge into the pockets on the inside between the top and bottom of the cylinder, a longitudinal trough which slopes downward inside the cylinder, together with a tank below said cylinder substantially as described.

8. In a paper stock screening machine, the

, combination of a separating cylinder having a plurality of interior pockets with perforate walls and open toward the inside, with ,a driving shaft which carries the separating cylinder, a drying cylinder also carried thereby, a stock inlet pipe which enters the separating cylinder, a cone which extends" from thedrying cylinder into the separating cylinder, a longitudinal trough which slopes downward inside the separating cylinder to a point inside the" come, together with a tank below said cylinder substantially as described.

9. In a paper stock screening machine, the

combination of shaft bearings, a supporting shaft slidable in said bearings, and a foraminous separating cylinder carried thereby having a plurality of interior pockets open toward' the supporting shaft, with a stock inlet pipe which enters the cylinder at such a point as to discharge into the pockets on theinside between the top and bottomf of the cylinder, a trough which slopes-down- ,war d inside of and lengthwise of the cylinder, a tank below the cylinder. and means for moving the shaft and cylinder back and forth in\its bearings substantially as described.

10. Ina screening machine, a rotatable, foraminous screening drum having interiorblades and means to deliver stock to said blades along. a line at one side of and radially removed from the axis of the drum.

-11. In a screening machine, a rotatable,

foraminous screening drum having interior,

longitudinally extending webs forming inwardly opening pockets, and means to de- .liver stock to said pockets along a line at one side of and radially removed from the axis of the drum.

12. In a screening machine, a rotatable,

foraminous screening drum having interior perforate blades, and means to deliver stock to said bladesalong a line at one side of and I radially removed from the axis of the drum.

' the length thereof.

15. In a screening machine, a rotatable, foraminous screening drum, a stock in-let pipe extending therein having a discharge mouth opening at one side of the vertical axis thereof, said discharge mouth having a weir-like lower edge over which stock is delivered to the descending side of the drum in sheet-like form.

16. In a screening machine, a rotatable, foraininous screening drum having interior .blades, a stock in-let pipe extending therein at one side ofthe axis thereof, having a discharge mouth having a weir-like lower edge over which stock is delivered to said blades on the .descending side of the drum in sheet-like form. p

17. In a screening machine, a rotatable, foraminous screening drum having interior,

longitudinally extending \vebs forming inwardly opening pockets, a stock in-let pipe extending therein at one side of the axis thereof. having a discharge mouth having a \veir-like lower edge over which stock is delivered to said pockets on the descending side of the drum 'in sheet-like form.

18. In a screening machine, a rotatable, foraminous screening drum having interior perforate \vebs, a stock in-let pipe extending therein at one side of the axis thereof, having a discharge mouth having a weirlike lower edge over which stock is delivered to said blades on the descending side of the drum in sheet-like form.

19. In a screening machine, a rotatable, foraminous screening drum having interior, longitudinally extending, perforate webs forming in ardly'opening pockets. a stock in-let pipe extending therein at one side of the axisthereof, having a discharge mouth having a weir-like lower edge over which stock is delivered to said pockets on the descending side of the drum in sheet-like form. I

20. In a screening machine, in combination, screening means rotatable on journals slidable on their bearings, and means to rotate said screeningmeans and to impart to it a reciprocating movement in the bearings; feeding means to deliver to said screening operation.

screening means the material to be screened, and means to deliver from said screening means the material retained therein in the 21. In a'screening machine, in combination, a fOIfiIIllllOUS screening drum, means to feed stock to the interior of. said drum, 7

a gravity discharge forthe residue of the screening operation, extending into said drum, and means to deliver said residue to said discharge. i V

22. In a. screening-machine, in combina tion, a foraminous screening drum, means to feed stockto the interior of said drum,a sloping discharge trough for the residue of the screening operation, extending into said drum, and means to deliver said residue to said trough. V g

23. In a screening machine, in combination, a rotatable, foraminous screening drum, interior,- longitudinally extending blades on said drum, means to feed, stock to the'interior ofsaid drum, and conveyer means extending 1I1t0' the drum and arranged to receive the residue ofthe screening operation from said blades.

24. In a screening machine, in combination, a rotatable, foraminous screening drum formed withinteriorly openingpockets, means to feed stocktothe interior of said drum, and conveyer means extending into the drum and arranged toreceive the residue of the screeningoperation from said pockets. I

25. In a screening machine, in combination, a rotatable, foraminous screening drum formed with interiorlyopening pockets having perforatev \valls, means to; feed stock to the interior of said drum, and conveyer means extending int'o the drum and arranged to receive the residue of the screening operation from said blades.

26. In a screening machine,.in combination, a screening means having interior coin.- partments, means to'deliver stock to one of said compartments-and successively operating means to submergethe residue in said compartment and to discharge. the rescreened residue.

27. In a screening machine, in combination. a movable screening means, means to feed stock to said screening. means. means to agitate the unscreened residue. and means to carry aivay theresidue after a furtherscreening operation. the mentioned means acting successively during. the movement of the screening means. 1

28. In a screening machine. in combination. a movable screening means, means to feed stock to said screening meansimeans to apply \vaterto the screeningmeans to agitate the unscreened residue. vanes to carry the residue. and conveyer means adapted to receive the rescreene'dresidue from the vanes and discharge it from said screening means.

29. In a screening machine, in combinascreened residue of each portion from its part of the screening-means before the supply of fresh stock thereto.

30. In a screening machine, in combination, a screening means having compartments, means to supply stock to the compartments, and means to remove'the unscreened residue from each compartment before the supply of fresh stock thereto.

31. In a screening machine, in combination, stock'supply means, separated screen- ;ing devices arranged for successive presentation to said stock supply means in endless series, and means to remove the'unscreened residue from each screening device before the supply of fresh stock thereto. 1

32. A foraminous screening drum of prismatic form having interior, longitudinal perforate blades.

- 33. A foraminous screening drum of prismatic form having interior, longitudinal perforate partitions forming inwardly opening pockets.

34. A foraminous screening drum of prismatic form having interior longitudinal perforate blades at the angles of the prism.

35. A foraminous screening drum of prismatic form having interior, longitudinal perforate partitions at the angles of the prlsm forming-inwardly opening pockets.

36; In a screening machine, a rotatable, foraminous screening drum having the form of a frustum, the axis of the frustum being horizontal. j v

37. In a screening machine, a rotatable, 'foraminous screening drum having the form of a prismatic frustum, the axis of the frustum being horizontal. 38. In a screening machine, a rotatable, foraminous screening drum having the form of a double frustum, the larger bases of the parts being adjacent each other.

39. In a screening machine, a rotatable,

I foraminousscreening drum having the form of a double prismatic frustum, the larger bases of the parts being adjacent each other.

40. In a screening machine, in combination, a foraminous screening drum, a foraminous drying drum having .the form of a frustum, means to supply stock to the screening drum, and means to discharge the unscreened residue from the screening drum into the smaller end of the frustum.

41. In a screening machine, a screening drum, a drying drum, a supporting means common to both said drums and suspendingthem on either side thereof and a shaft aboutwhich said common supporting means is rotatable.

42. In a screening machine, a screening drum, a drying 'drum, a supporting means ery thereof, radial partition walls between the screen plates, separating the cage into a series of compartments, a supply inlet for the stockand an exit for the screened stock communicating one with the exterior of thecage and the other with the interior thereof, means to rotate the cage to present said compartments in succession to the unscreened stock at a point above the level of the screened stock but to carry the stock in any compartment below the level of the body of screened stock, said partition walls being effective to lift the unscreened residue above the level of the screened stock, and means for maintaining a flow of water across the screening plates to wash the unscreened residue therefrom before the supply of fresh stock thereto. 44. A device of the character described comprising a tank, a screen cage revolubly mounted therein, partition walls separating the said cage into a plurality of compartments, provided each with a screening device, a supply inlet for the stock and an exit for the screened stock communicating one with the exterior ofthe cage and the other with the interior thereof, means to rotate the cage to present the said compartments in succession to the unscreened stock at a point above the level of the screened stock, means to rotate the cage to carry the stock in each compartment through the body of screened stock, said partition walls being effective to lift the unscreened residue above the level of the screened stock and the unscreened residue being removed from the screening device of each compartment before the supply of fresh stock thereto.

45. In a device of the character described, the combination with a. tank, a screen cage revolubly mounted therein, partition walls separating the screening surface thereof into a plurality of units, a supply inlet fonthe means to rotate the cage to presenflthe said screening units in succession to the unscreened stock at a point above the level of the screened stock in the tank, means to rotate the cage to carry the stock in any one unit through the body of screened stock in the tank, said partition walls being effective to lift the unscreened residue on the screening unit above the level ofthe screened stock, and means to remove the unscreened residue from the surface of each screening unit before the supply of fresh, unscreened stock thereto.

stock and an exit for the screened stock,

416. A device of the' character described, comprising a tank, a screen cage revolubly mounted therein, partition walls separating the screening surface into a plurality of units, a supply inlet for the stock and an exit for the screened stock, means to rotate the cage to present sa d screening units in succession to the screened stock at a point above vices arranged for successive presentation to said stock supply "means in endless series above the level of said screened stdclgmeans to move said screening devices to carry the stock supply through said body of screened stock and then out of the same, and means to remove the unscreened residue from each screening device before the supply of fresh stock thereto.

48. In a screening machine, the combination of a polygonal screening drum, radial Walls carried by said drum, and stock supply means to supply stock to said radial Walls and thereby impart a turning movement to the drum. V

49. In a screening machine, in combination, a rotatable, foraminous screening'drum, a stock inlet pipe located to deliver stock to the interior of the drum, means provided the drum to receive the stock and impart through its delivery a turning movement to the drum. 1

50. In a pulpscreen the combination of a rotatable" screen drum, provision on the drum for receiving the stock :and utilizing the headthereof to turn the drum, and a stock inlet for directing stock thereagainst.

51. In a pulp screen, the combination of a i screendrum, radial blades therein, a stock inlet and means for utilizing the head ofthe stockagains't said'blades to turn the drum.

52. In a pulp screen,-the combination of a screen drum, a stock inlet, and means for utilizing the head of the stock to turn the drums In testimony where'ofI, hereto aflix my signature in presence of two witnesses.

ANTON J. HAUG. Witnesses EDWARD H. WASON, JOSEPH SIMON. 

